Determining the storage, availability and reactivity of NH3 within Cu-Chabazite-based Ammonia Selective Catalytic Reduction systems.

@article{LezcanoGonzlez2014DeterminingTS,
  title={Determining the storage, availability and reactivity of NH3 within Cu-Chabazite-based Ammonia Selective Catalytic Reduction systems.},
  author={In{\'e}s Lezcano-Gonz{\'a}lez and Upakul Deka and Bj{\o}rnar Arstad and Andy Van Yperen-De Deyne and Karen Hemelsoet and Michel Waroquier and Veronique Van Speybroeck and Bert M Weckhuysen and Andrew M Beale},
  journal={Physical chemistry chemical physics : PCCP},
  year={2014},
  volume={16 4},
  pages={
          1639-50
        }
}
Three different types of NH3 species can be simultaneously present on Cu(2+)-exchanged CHA-type zeolites, commonly used in Ammonia Selective Catalytic Reduction (NH3-SCR) systems. These include ammonium ions (NH4(+)), formed on the Brønsted acid sites, [Cu(NH3)4](2+) complexes, resulting from NH3 coordination with the Cu(2+) Lewis sites, and NH3 adsorbed on extra-framework Al (EFAl) species, in contrast to the only two reacting NH3 species recently reported on Cu-SSZ-13 zeolite. The NH4(+) ions… CONTINUE READING
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